Highly Emissive Self-Trapped Excitons in Fully Inorganic Zero-Dimensional Tin Halides.

Highly Emissive Self-Trapped Excitons in Fully Inorganic Zero-Dimensional Tin Halides.
Angew Chem Int Ed Engl. 2018 Jul 12;:
Authors: Benin BM, Dirin DN, Morad V, Wörle M, Yakunin S, Rainò G, Nazarenko O, Fischer M, Infante I, Kovalenko MV
Abstract
The spatial localization of charge carriers to promote the formation of bound excitons and concomitantly enhance radiative recombination has long been a goal for luminescent semiconductors. Zero-dimensional materials structurally impose carrier localization and result in the formation of localized Frenkel excitons. Here we report that the fully inorganic, perovskite-derived zero-dimensional Sn(II) material Cs4SnBr6 exhibits room temperature, broad-band photoluminescence centred at 540 nm with a quantum yield (QY) of 15±5%. A series of analogous compositions following the general formula Cs4-xAxSn(Br1-yIy)6 (A = Rb, K; x ≤ 1, y ≤ 1) can be prepared. The emission of these materials ranges from 500 nm to 620 nm with the possibility to compositionally tune the Stokes shift and the self-trapped exciton emission bands.
PMID: 29999575 [PubMed - as supplied by publisher]

Source: Angewandte Chemie - July 12, 2018 Category: Chemistry Authors: Benin BM, Dirin DN, Morad V, Wörle M, Yakunin S, Rainò G, Nazarenko O, Fischer M, Infante I, Kovalenko MV Tags: Angew Chem Int Ed Engl Source Type: research